There are several types of sandstone namely Arenite & Wacke. Based on its constituent components Detrital sedimentary rocks are divided into fragments, matrices, and cement. Arenite is a sedimentary sandstone with little or no matrix composition. One characteristic is the brilliant color.
The type of rock found in the Upper Padang River shows a brilliant white characteristic with a dominance of 60-70 percent silica accompanied by iron content characterized by red and feldfar. This type of Arenite Sandstone is Arkose Arenite. This type of rock characterizes a slow deposition process with a perfect material washing process.